People that play antisocial decks aren't inherently antisocial themselves.

Or they are just very good at pretending. Many serial killers can also play nice when they want to do so...

Seriously though, I wonder how they react when locked out themselves. My (admittedly limited) experience has been that those who champion the "anything legal goes" mantra are the first and loudest to complain when you do something they don't like*.

*Example: A Memnarch player had his Palinchron exiled while trying for "infinite mana - steal all permanents without shroud/hexproof" combo; then threw a fit because I stole three creatures (exactly one from each opponent) with Peer Pressure and Olivia Voldaren (6URRR cost over two turns with my Garza Zol vampire tribal)